A solid conducting sphere of radius r is having a charge of Q and point charge q is a distance d from the centre of sphere as shown. The electric potential at the centre of the solid sphere is :

A solid conducting sphere of radius r is having a charge Q and point charges +q and -q are kept at distance d from the centre of sphere as shown in the figure. The electric potential at the centre of solid sphere (assume potential to be 0 at infinity)

A solid conducting sphere of radius 'a' is surrounded by a thin uncharged concentric conducting shell of radius 2a . A point charge q is placed at a distance 4a from common centre of conducting sphere and shell. The inner sphere is then grounded The charge on solid sphere is

A solid conducting sphere of radius 'a' is surrounded by a thin uncharged concentric conducting shell of radius 2a . A point charge q is placed at a distance 4a from common centre of conducting sphere and shell. The inner sphere is then grounded The charge on solid sphere is

A non-conducting sphere of radius R is given a charge Q. Charge is uniformly distributed in its volume. The electric potential at centre and at the surface of sphere respectively are

A non-conducting sphere of radius R is given a charge Q. Charge is uniformly distributed in its volume. The electric potential at centre and at the surface of sphere respectively are

A non-conducting sphere of radius R is given a charge Q. Charge is uniformly distributed in its volume. The electric potential at centre and at the surface of sphere respectively are

A conducting sphere of radius R is give a charge Q. The electric potential and the electric field at the centre of the sphere are, respectively